/usr/share/maven-repo/org/eclipse/jetty/websocket/websocket-common/debian/websocket-common-debian.jar is in libjetty9-extra-java 9.2.14-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/eclipse/jetty/websocket/websocket-common/debian/../../../../../../../java/jetty9-websocket-common.jar